Download Extraocular muscles

STRABISMUS-AMBLIOPIABINOCULAR VISION
Doç.Dr.Şule Ziylan
Extraocular muscles
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Nervus abduscens
Nervus trochlearis
Nervus oculomotorius
Extraocular muscles
Extraocular muscles
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In order to see correctly both eyes
must move in same direction. This is
done by pulling by one muscle in one
direction and relaxing of other muscle.
Extraocular muscles
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Cranial Nerve III
medial rectus muscle,
superior rectus muscle,
inferior rectus muscle,
inferior oblique muscle
Cranial Nerve IV
superior oblique muscle
Cranial Nerve VI
lateral rectus muscle
Extraocular muscles
Binocular single vision
To see one object both eyes must look at it at
the same time. Each eye sees it from different
angle and each eye sends a slightly different
picture to the brain (Binocular vision). Brain
blends the two picture to give a three
dimensional image. This process is known as
fusion and it gives the ability to judge the
relative distance in two objects (depth
perception).
Binocular single vision
Seeing simultaneously with two eyes
Binocular single vision
Fusion
Stereopsis
???
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When should be the
first examination?
The propiate time
of vision testing?
Is a squint normal
in an infant?
Teller test
Strabismus
Misalignment of the eyes, known as
strabismus, is a common problem in childhood.
Strabismus is usually recognized by parents as
a crossing or drifting out of one or both eyes.
The drifting may be constant or intermittent.
The risk of strabismus is much higher when a
family history of "lazy eye" or crossed eyes is
present.
Strabismus
Nonparalytic strabismus
* Inward squint ( esotropia)
Nonparalytic strabismus
* Inward squint ( esotropia)
Nonparalytic strabismus
* Inward squint ( esotropia)
Nonparalytic strabismus
* Inward squint ( esotropia)
Nonparalytic strabismus
* Inward squint ( esotropia)
Nonparalytic strabismus
* Outward squint ( exotropia)
Nonparalytic strabismus
* Special forms
Nonparalytic strabismus
* Special forms
Nonparalytic strabismus
* Special forms
Paralytic strabismus
If the muscles are not
coordinated the images of to
eyes send two brain will not
fuse and one gets double vision.
The child quickly and
unconsciously learns to ignore
the image of one eye
(suppression) and the eye
becomes lazy (amblyopic)
Paralytic strabismus
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Sudden onset
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Diplopia
Systemic
investigation?
Paralytic strabismus
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3. nerve palsy
( N. Oculomotorius)
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4. nerve palsy
( N. Trochlearis)
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6. nerve palsy
( N. Abduscens)
Paralitik şaşılık
* 6. nerve palsy
AMBLYOPIA
The subvision without any organic
disease
???
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The age of amblyopia risk?
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The age of amblyopia treatment?
Amblyopia
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Strabismic amblyopia
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Anisometropic amblyopia
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Deprivation amblyopia
Amblyopia
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Strabismic amblyopia
Anisometropic
amblyopia
Deprivation amblyopia
Amblyopia
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Strabismic amblyopia
Anisometropic
amblyopia
Deprivation
amblyopia
THE PREVENTION AND
TREATMENT OF AMBLIOPIA
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Examination at 1. and 6 months of
age
Early diagnosis of strabismus
Early diagnosis of refractive errors
Oclusion therapy